THE SIMPSONS will air its 450th episode on Sunday, marking yet another milestone for the longest-running series. THE HOLLYWOOD REPORTER writes that the show, which began 20 years ago, will feature an hourlong documentary following the 450th episode: ONCE UPON A TIME IN SPRINGFIELD.

The documentary from Morgan Spurlock is aptly titled THE SIMPSONS 20th ANNIVERSARY SPECIAL IN 3-D ON ICE.